[Q] Why usb Storage via OTG need application with root access?

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http://forum.xda-developers.com – I wonder why Android 4.3 on my Nexus 7 || do NOT support reading from USB storage via OTG cable, or do NOT support USB modems. While on Samusng Galaxy || USB Storage it works seamlessly. I understand that you can do all of this with the Root access and with apps like https://play.google.com/store/apps/d...l.usbotg&hl=en https://play.google.com/store/apps/d...ppwidget&hl=en But I wonder why Samsung's modified version of Android support USB storage out of the box while the unmodified one not. Is this because Google and Asus want to make me to buy bigger capacity N (HowTos)